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Engine feels rough between 2500 and 3500 RPM

glamster

glamster

Just got it firing!
Joined
Jul 6, 2024
Messages
6
Location
Roanoke, Virginia,United States
Hi fellow Guzzi riders,

i recently bought a V7 Special, 2023 model. I finished the break-in period and did the initial oil change and valve clearance check myself.

Lately i feel the engine runs very rough from 2500 to 3500 RPM. It pulls fine, but the engine vibrates considerably and does not seem happy. It pulls nice and smooth at 2000 or 4000 and beyond. It does not feel right, but is this normal for Guzzis? Whenever i upshift, i land around the 3000 RPM, so i keep hitting this rough RPM range and it's annoying and concerning.

Any ideas what the issue might be?
 
Per the scrolling paragraphs top of page... Search and read. Dozens of posts on this topic.
 
Hi, just my thoughts...
Are you sure you got the valves adjusted properly, would help to know milage on it.
Have you done a TPS reset, might want to look at the GTM Store offerings above...
Check plugs to see if gap is right, how many miles on them....Is the bike stock?
 
I bought the V7 new. It now has 1600 miles. I did the oil change and valve clearance adjustment at 900 miles. I tried to set the valve clearances precisely at 0.1 mm intake and 0.15 mm exhaust. I think it would be good to re-check the clearances, so i'll do that next.

When i did the valve adjustment, i changed the pair of spark plugs with exactly the same type (NGK MR8BI8), for good measure although i realize it wasn't totally necessary to replace them yet. I did not adjust the gap on the spark plugs, maybe i should have? I assumed they're pre-set already.

I did not do a TPS reset
 
Perhaps you are expecting the bike, because it is a V-twin, to "chug" and produce torque at low RPMS? Guzzis don't roll that way. Even the 1100 and 1200 cc models run better and smoother at higher RPMs. EV-11s, for example, weren't happy shifted into top gear cruising on the highway until about 80 MPH. My Stelvio 1200 runs smoother and gets better gas mileage at 65 mph in 5th gear instead of 6th.

Don't make the engine pull hard at 2500 - 3500 rpm and see how it does ...

Lannis
 
thanks for the notes. When the engine feels rough through this rev range, i'm not pushing it hard at all. In fact, the engine feels rough even during deceleration while engine breaking over this rev range. I'll observe more closely tomorrow during a ride. I don't recall experiencing this roughness during the initial 900 mile break-in period where i tried to mostly ride below 4500 RPM while varying the RPM, so i rode through the problematic 2500-3500 RPM range a lot. I suspect the valve clearance is slightly off
 
You should have checked the plug gap. Same plug used in lots of applications with different gaps.
But, it's not the issue. Keep it at 4000 for the next couple of thousand miles and run the thing to red line or at least 6000RPM every ride. Guzzi's need to breathe, and break in!
 
glamster said:
Hi fellow Guzzi riders,

i recently bought a V7 Special, 2023 model. I finished the break-in period and did the initial oil change and valve clearance check myself.

Lately i feel the engine runs very rough from 2500 to 3500 RPM. It pulls fine, but the engine vibrates considerably and does not seem happy. It pulls nice and smooth at 2000 or 4000 and beyond. It does not feel right, but is this normal for Guzzis? Whenever i upshift, i land around the 3000 RPM, so i keep hitting this rough RPM range and it's annoying and concerning.

Any ideas what the issue might be?
Click to expand...
All moving things vibrate, it's their nature but I suspect that it's an adsorption issue.
Check engine and muffler mounts and radiate out from there.
Past that I would look at fuel and pre ignition.
Lugging an engine with large throttle openings pushes the piston down faster than it can move, and 'absorb' the force
So as mentioned, spin the engine.
But, it's just of lately?
Something recent has changed then.
 
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